220 AMALIA. 



A. PECTINATA, Selenka. PL 54, figs. 68, 69. 



Finely rugose, strongly carinate, shield smooth, rounded, free 

 in front, flattened or slightly emarginate on the posterior margin, 

 bearing a shell-sulcns, under which is a small oval shell, with 

 posterior median nucleus; shield and back blackish brown, foot 

 and head grayish brown. Length (in spirits), 30 mill. 



Sydney, N. S. Wales. 



A. SANDWICHENSIS, Eydoux. PI. 54, figs. 70-73. 



Acuminate behind, obliquely grooved, with a marginal groove 

 surrounding the foot; shield large, finely granular, free in front; 

 brownish black above, whitish below. Length, 20 mill. 



Sandwich Islands. 



The shell-plate is figured with a central nucleus, like a Patella; 

 if the figure is correct, this character might serve for the crea- 

 tion of a new genus. I place the species in Amalia with some 

 reserve because the description is insufficient. 



A. HEWSTONI, Cooper. PI. 54, fig. 75. 



Back strongly carinate ; mantle granulate-rugose, with a sub- 

 elliptical groove above the level of the respiratory orifice, which 

 is just behind the middle ; color blackish brown, or deep black 

 above, the sides paler, the base of the foot whitish. 



Length, 2'5 inches. 



Gardens, in San Francisco, Gal. 



In the remarkable groove on the mantle it differs from others 

 described ; this does not coincide with the outline of the attached 

 portion of the mantle, or with the internal plate. It is some- 

 times scarcely visible (Cooper). 



It is possibly an introduced species, as it has only been seen 

 in San Francisco. Dr. Cooper suggests that it may be L. Sand- 

 wichensis. 



Section GIGANTOMILAX, Bottger, 1883. 



A. LEDERI, Bottger. PI. 2, figs. 99, 100. 



Rugose ; shield anterior, rounded behind ; dorsum strongly 

 carinated ; central zone of locomotive disk scarcety wider than 

 the lateral zones ; blackish, the sides marbled with gray, carina 



and shield gray. Length (in alcohol), 68 mill. 



Caucasus. 



